does tar from cigarettes go away What happens to the deposit of and other chemicals in the lungs if a smoker stops smoking? : r/askscience Science Of Nicotine And Addiction:

In addition to the potential biases as described above, there is the potential for non-smokers and/or clinicians to underestimate the difficulties of achieving durable smoking cessation

Not to mention, withdrawal during the night can trigger irritability, panic, or sadness, especially in those with existing mental health conditions

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The study also noted that smoking as few as three cigarettes a day substantially increased the risk of complicated disease

The global e-cigarette market is projected to grow from $22.5 billion in 2022 to $47.5 billion in 2028, with a compound annual growth rate (CAGR) of 13.5% from 2023 to 2028 (12)